CN102345797A - System for monitoring oil-gas pipeline in mining subsidence area - Google Patents
System for monitoring oil-gas pipeline in mining subsidence area Download PDFInfo
- Publication number
- CN102345797A CN102345797A CN2010102426354A CN201010242635A CN102345797A CN 102345797 A CN102345797 A CN 102345797A CN 2010102426354 A CN2010102426354 A CN 2010102426354A CN 201010242635 A CN201010242635 A CN 201010242635A CN 102345797 A CN102345797 A CN 102345797A
- Authority
- CN
- China
- Prior art keywords
- position unit
- fiber
- bragg grating
- fiber bragg
- grating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention discloses a system for monitoring an oil-gas pipeline in a mining subsidence area based on a fiber grating sensing technology. The system comprises a pipe body strain monitoring device, a pipe-soil relative displacement monitoring device and a mining subsidence area horizontal deformation monitoring device; a fiber grating strain sensor a (3) and a pipe-soil relative displacement sensor a (4) are arranged on the monitoring section of an oil-gas pipeline a (2) of a mining subsidence area (1); sensors on every section are connected in series by fusing, and are connected with an optical cable a (7) through a fiber junction box a (6); the optical cable a (7) is connected with an optical switch (8); the optical switch (8) is connected with a fiber grating demodulator (9); the demodulator (9) is connected with a lower computer (10); data preprocessed with the lower computer (10) are transmitted through a wireless communication module a (11), received by a wireless communication module b (12) and transmitted to an upper computer (13); and a fiber grating sensing network a (5) is used for monitoring soil body horizontal displacement in real time and transmitting data to the upper computer (13).
Description
Technical field
The present invention be a kind of based on fiber grating sensing technology adopt sky subsidence area oil and gas pipes monitoring system, relate to measurement and the pipe-line system technical field of measuring stress, the measurement of temperature, similar linear dimension.
Background technique
The underground ore bed space that is formed by the exploitation back is called the goaf.Underground ore bed its rock stratum, top loses support by after the exploitation, and equilibrium conditions is destroyed, and produces crooked, slump thereupon, so that develops into the surface subsidence distortion, causes surface subsidence, forms lowland.Along with the continuous expansion in goaf, lowland constantly develops and forms and adopt the sky subsidence area, so on the ground or underground buildings or structures produce harm.Adopting the sky disaster of subsiding is to cause one of the principal mode of the geological disaster of human life's property loss.Length can reach thousands of kilometers apart from oil transportation or gas pipeline fed distance, often will pass inevitably and adopt the sky subsidence area.Owing to the reasons such as further exploitation of the insufficient or underground ore body of route selection, might in movable collapse basin, pass through at the pipeline of adopting the sky subsidence area, thereby make the safe operation of pipeline suffer serious threat.
Build up global article one crude oil pipeline as far back as the U.S. in 1865 and rise, the world has promptly entered into the epoch of pipeline operation, and pipeline then constantly occurs through the goaf problem.Stipulated " the NCB method " of prediction pipeline in " project handbook subsides " of coal timeliness of Britain country in 1975 promulgation through the coal mine gob surface subsidence.1986; World pipeline research institute entrusts Battelle research institute to study with the method for preventing and treating passing through the stressed proterties of the pipeline of adopting the sky subsidence area; Formed " the pipeline monitoring and the control in mining damage district " report (NG-18; No.155); This project system has been summed up and has been adopted the characteristic that sky subsides; Analyzed of the harm of slow-witted dead zone, developed corresponding Stress calculation software, proposed subsidence area pipeline monitoring method pipeline.
Though China's pipeline cause is started late; But the pipeline industry of China be in flourish among; Mostly that China is the western abundant petroleum gas of these pipelines is transported to the east of China, is stepping up to build and the energy conveyance conduit planned has many thousands of kilometers pipelines such as transfering natural gas from the west to the east, middle remote pipeline, blue Zheng's long pipeline.These pipelines are through many mineral goaf or following mining area.As 8 mining areas of transfer natural gas from the west to the east a spool line approach Shanxi, Shandong, Shaanxi, 4 provinces and regions, Ningxia; Be subjected to the influence in the part goaf of 76 pit minings formation; The about 887.494km of total length; The goaf is in case form; To destroy face of land equilibrium conditions; Cause face of land large size sinking, depression, crack or bring out secondary disasters such as landslide, avalanche, directly influence pipe safety; Shan crow natural gas line is adopted the sky subsidence area through 12 places on the way, and the about 12.6km of influenced total length constitutes significant threat to pipe safety production, and is wherein serious with reed Cao Gou subsidence area; Capital, Shan gas transmission line is by way of the shanxi coal mining area, and the long product pipeline Henan Section of blue Zheng, the big crude oil pipeline of iron etc. are also adopted disasters such as sky subsides easily.
In the face of numerous sky disasters of subsiding of adopting; Though the pipeline operator of China has been taked positive engineering protection measure; But also there is the drawback of some in these measures; At first be that cost is high; Next is that shielding engineering are not " putting things right once and for all " yet; The uncertain factor of design and construction is more, moreover cycle length and improvement that protection is administered are difficult for grasping opportunity.The monitoring then be a kind of efficiently, protection method cheaply.The international pipeline research institute of the U.S. (PRCI) will monitor pipeline and adopt the subside main mode of disaster of sky as control, and pipelines such as the transfering natural gas from the west to the east of China, capital, Shan line are gone into operation and then the goaf also effectively monitored.
Traditional goaf soil deformation adopts theodolite, level instrument, steel ruler, offset scale and methods such as electronic tachometer or GPS; The real-time of these methods is all relatively poor; All be that the face of land this existing phenomenon of having subsided is carried out result monitoring, be difficult to satisfy the requirement of goaf monitoring advanced prediction, long-term and real-time online.The monitoring of traditional pipeline strain is counted the master with electric resistance wire strain gauge, vibrating string type strain, and relatively poor aspect corrosion-resistant, anti-interference, stability also is difficult to meet the demands.The distributing optical fiber sensing technology of rise in recent years (is representative with BOTDR) is existing certain application aspect the body monitoring.
These present monitoring modes all are confined to subside to adopting sky (causing the calamity body) or pipeline (hazard-affected body) carries out independent monitoring; Also do not carry out the combined monitoring of system, the leading monitoring and the pipeclay relative displacement of adopting sky subsidence area soil deformation information are not monitored yet adopting sky collapse-deformation and influence pipeline down thereof.Combined monitoring can not only be judged active situation, the growth rule of development, the failure mechanism of adopting the sky effect of subsiding in advance; Can also find out that adopting sky subsides to the influence mode and the degree of pipeline; The more important thing is the stress change in displacement rule that to grasp steel pipe; Judge the safe condition of pipeline, confirm to provide foundation for control opportunity.Comprehensive above information just can be carried out safe early warning to adopting sky subsidence area pipeline, forecasts the steady state in goaf and the hazardous condition of pipeline in advance, for the mitigation design for scheme implements to provide foundation.Combined monitoring has been represented the trend of adopting the pipeline monitoring of sky subsidence area.
Fiber bragg grating is a fiber optic passive device with the fastest developing speed in recent years.It is a kind of space periodicity refractive index profile of utilizing the light sensitive characteristic of fiber optic materials on the fibre core of optical fiber, to set up, its role is to change or control light in this regional dissemination mode.Except that have the anti-electromagnetic interference of ordinary optic fibre, size is little, in light weight, intensity is high, the characteristics such as high temperature resistant, corrosion-resistant, fiber bragg grating also has its unique characteristic: be easy to little with optical coupling, coupling loss, be easy to Wavelength Division Multiplexing etc.Thereby make fiber bragg grating wide prospect arranged in fields such as optical-fibre communications and Fibre Optical Sensors.As a kind of emerging technology of photon research field, be that the sensory technique of pedestal sensor spare receives common concern in recent years with the fiber bragg grating, the various countries researcher actively develops relevant research work.At present; The physical quantity that the fiber-optic grating sensor of having reported can be monitored has: temperature, strain, pressure, displacement, pressure, torsional angle, moment of torsion (twisting stress), acceleration, electric current, voltage, magnetic field, frequency, concentration, thermal expansion coefficient, vibration etc., the practical application of wherein a part of fiber grating sensing system.
Fiber Bragg Grating FBG (Fiber Bragg Grating) be the most simply, the most general a kind of fiber bragg grating.It is that one section refractive index is periodically variable optical fiber, and its index modulation degree of depth and grating cycle generally all are constants.The variation of temperature, strain can cause the cycle and the change of refractive of Fiber Bragg Grating FBG, thereby the reflective spectrum of Fiber Bragg Grating FBG and transmission spectrum are changed.The variation of reflective spectrum and transmission spectrum through the detection fiber Bragg grating just can obtain the information of corresponding temperature and strain, and Here it is measures the basic principle of temperature and strain with Fiber Bragg Grating FBG.
Can know that by coupled mode theory Fiber Bragg Grating FBG can be coupled to another guided mode that transmits in opposite direction with a guided mode that wherein transmits and form narrowband reflection, peak reflectance wavelength (bragg wavelength) λ uniformly
BFor:
λ
B＝2n
effΛ(1)
In the formula: λ
BBe bragg wavelength; n
EffEffective refractive index for the spread fiber pattern; Λ is a grating pitch.
Can get the centre wavelength of grating and the relation of temperature and strain to formula (1) differential:
Where:
is the thermal expansion coefficient of the fiber;
to fiber-optic coefficient of thermal;
elastic material for the fiber-optic coefficient.Can know that by formula (2) strain is because the flexible and elasto-optical effect in Fiber Bragg Grating FBG cycle causes the variation of bragg wavelength, and temperature is because Fiber Bragg Grating FBG thermal expansion effects and thermo-optic effect cause the variation of bragg wavelength.
Fiber bragg grating can be made into various sensing meanss, is used widely at sensory field.Compare with traditional electric transducer; Fiber-optic grating sensor has own unique advantage: (1) sensing head is simple in structure, volume is little, in light weight, shape variable; Be fit to imbed in the various large scale structures, but inner stress, strain and the structural damage etc. of measurement structure, stability, good reproducibility; (2) and have natural compatibility between the optical fiber, be prone to be connected with optical fiber, light loss consume low, spectral characteristic good, reliability is high; (3) have non-conducting, little to measured medium influence, have characteristics anticorrosive, anti-electromagnetic interference again, be adapted at working in the rugged environment; (4) light and handy soft, can in an optical fiber, write a plurality of gratings, constitute sensor array, combine with Wavelength Division Multiplexing and time division multiplex system, realize distributed sensing; (5) metrical infromation is with Wavelength-encoding, thereby fiber-optic grating sensor is not subjected to the influence of factors such as light intensity function, optical fiber connection and coupling loss, the optical polarization variation of light source, the antijamming capability that tool is stronger; (6) high sensitivity, high degree of resolution.
Compare with widely used Brillouin light domain reflectometer BOTDR, the advantage of fiber-optic grating sensor has: (1) can accurately locate measuring point, and resolution is high; (2) cost is low; (3) can process, encapsulate transducing part, make it be more suitable for on-the-spot rugged environment.
Because these advantages; In the Geotechnical Engineering field; Fiber-optic grating sensor is easy to imbed in the rock soil mass strain and the temperature to its inside and carries out high-resolution and large-range measuring; Technical advantage is very obvious; Especially be embodied in and obtain long-term, reliable rock soil mass deformation data, also do not see the report that fiber grating sensing technology is used for goaf body strain, pipeclay relative displacement and goaf pipe laying band soil body horizontal distortion combined monitoring at present.
Summary of the invention
The objective of the invention is to invent that a kind of spatial resolution is high, cost is low, adopt sky subsidence area oil and gas pipes monitoring system based on the fiber bragg grating real-time online safely and effectively.
The present invention propose based on fiber grating sensing technology adopt sky subsidence area oil and gas pipes monitoring system, comprise three parts: body strain monitoring device, pipeclay relative displacement monitoring device, adopt sky subsidence area soil body horizontal distortion monitoring device.Wherein, Fiber-optic grating sensor real time on-line monitoring device is adopted in body strain and pipeclay relative displacement; Adopt sky subsidence area horizontal distortion and adopt optical fiber grating sensing net real time on-line monitoring device, fiber bragg grating early warning content comprises the early warning to the body ess-strain, the early warning of pipeclay relative displacement and the early warning of pipeline top soil deformation.
The overall formation of adopting sky subsidence area oil and gas pipes combination monitoring system as shown in Figure 1.It comprises body strain monitoring device, pipeclay relative displacement monitoring device, adopts sky subsidence area horizontal distortion monitoring device three parts.Fiber Bragg grating strain sensor a3 and pipeclay relative displacement transducer a4 are installed on the monitoring cross section of the oil and gas pipes a2 that adopts sky subsidence area 1; Sensor welding series connection on each cross section; Be connected with the optical cable a7 that causes the monitoring station through optical Fiber Closure a6 then; In the monitoring station; Optical cable a7 is connected with optical switch 8; Optical switch 8 is connected with fiber Bragg grating (FBG) demodulator 9; Fiber Bragg grating (FBG) demodulator 9 is connected with lower-position unit 10; Lower-position unit 10 pretreated data are through GPRS communication module a11 transmission, and GPRS communication module b12 passes to upper-position unit 13 after receiving; Simultaneously, the optical fiber grating sensing net a5 that lays on the pipe top monitors earth horizontal displacement in real time, also with data transmission to upper-position unit 13.
The concrete body of adopting sky subsidence area oil and gas pipes combination monitoring system constitutes as shown in Figure 9, and this system is divided into on-site data gathering transmission system and long-range receiving and analyzing system.Comprising body strain monitoring device, pipeclay relative displacement monitoring device, adopt sky subsidence area horizontal distortion monitoring device three parts.
The on-site data gathering transmission system comprises optical fiber grating sensing net, fiber Bragg grating strain sensor, fiber grating displacement sensor, optical switch, fiber Bragg grating (FBG) demodulator, lower-position unit, GPRS communication module; Optical fiber grating sensing net, fiber Bragg grating strain sensor, fiber grating displacement sensor output connect the input of optical switch respectively; The output of optical switch connects the input of fiber Bragg grating (FBG) demodulator; The output of fiber Bragg grating (FBG) demodulator connects the input of lower-position unit, and the output of lower-position unit connects the GPRS communication module.
Long-range receiving and analyzing system comprises that GPRS communication module, upper-position unit, the reception of data-signal remote live, data signal analysis and processing, change curve dynamically show; The output of GPRS communication module connects the input of upper-position unit, and the output of upper-position unit connects the dynamically input of demonstration of the reception of data-signal remote live, data signal analysis and processing, change curve respectively.
Fiber Bragg grating strain sensor a3 and pipeclay relative displacement transducer a4 pass to optical switch 8 with body strain and pipeclay relative displacement signal through optical cable a7; Optical switch 8 is after fiber Bragg grating (FBG) demodulator 9 demodulation reach lower-position unit 10; Lower-position unit 10 calls self-editing program; Control optical switch 8 and fiber Bragg grating (FBG) demodulator 9 are realized the collection of data and data are carried out pretreatment; Pretreated data receive through GPRS communication module a11 transmission, GPRS communication module b12 and pass to upper- position unit 13, and 13 pairs of data of upper-position unit are carried out further analysing and processing, judge the force and deformation state and the pipeclay relative displacement of pipeline; Simultaneously; Optical fiber grating sensing net a5 monitors soil body horizontal distortion in real time; Also with the same manner with data transmission to upper-position unit 13; 13 pairs of soil deformation data of upper-position unit are analyzed; And combine the distortion of pipeline and the analysis result of pipeclay relative displacement, judge the situation of subsiding of the safe condition and the goaf soil body of adopting sky subsidence area pipeline.
The electric principle of this system as shown in figure 10; Monitoring pipe body strain respectively; The pipeclay relative displacement; Three type optical fiber grating sensors--the fiber Bragg grating strain sensor a3 of subsidence area horizontal distortion; Fiber grating displacement sensor a4; The PC joint of optical fiber grating sensing net a5 is connected with the PC joint of optical switch 8 with optical cable a7; The R232 of optical switch 8 connects the R232 interface of lower-position unit 10; The PC joint of optical switch 8 connects the PC interface of fiber Bragg grating (FBG) demodulator 9SM125; The LAN port of fiber Bragg grating (FBG) demodulator 9SM125 connects the LAN port of lower-position unit 10; The output of lower-position unit 10 is by the VGA end of VGA termination display device; The R232 port of lower-position unit 10 connects the R232 port of GPRS transmission module a11 Siemens MC 35i; GPRS transmission module a11 is through antenna GSM; GPRS network; Received the R232 that is afterwards received upper-position unit 13 by R232 by GPRS receiving module b12 antenna GSM, the output of upper-position unit 13 is by the VGA end of VGA termination display device.
The output signal of three type optical fiber grating sensors of body strain, pipeclay relative displacement, subsidence area horizontal distortion through optical switch 8 one by one conducting transfer to fiber Bragg grating (FBG) demodulator 9; The centre wavelength displacement amount that fiber Bragg grating (FBG) demodulator 9 demodulates each fiber-optic grating sensor transfers to lower-position unit 10, and the cycle of optical switch 8 Continuity signals is by lower-position unit 10 controls.10 pairs of data of lower-position unit are carried out pretreatment; And the data after will handling are defeated by GPRS transmission module a11; GPRS transmission module a11 is transferred to the upper-position unit 13 that is positioned at office with each monitoring variable that lower-position unit 10 calculates through public's cordless communication network; Upper-position unit carries out analysing and processing through self-programmed software to data, is shown by display device.
Wherein:
Said body strain monitoring device comprises fiber Bragg grating strain sensor a3, optical switch 8, fiber Bragg grating (FBG) demodulator 9, lower-position unit 10, GPRS communication module a11, GPRS communication module b12, upper-position unit 13; Because optical switch 8, fiber Bragg grating (FBG) demodulator 9, lower-position unit 10, GPRS communication module a11, GPRS communication module b12, upper-position unit 13 are shared, and the special part in the body strain monitoring device only is described here; As shown in Figure 3; Each 90 ° of direction in interval, monitoring cross section at pipeline b14 are evenly arranged 3 fiber Bragg grating strain sensor a15, fiber Bragg grating strain sensor b16, fiber Bragg grating strain sensor c17 and temperature compensation sensors 18; 4 sensors are connected through welding; Be connected with optical cable b20 through optical Fiber Closure a19 then, optical cable b20 causes the monitoring station with signal;
Said pipeclay relative displacement monitoring device comprises fiber grating displacement sensor b25, optical switch 8, fiber Bragg grating (FBG) demodulator 9, lower-position unit 10, GPRS communication module a11, GPRS communication module b12, upper-position unit 13; Because optical switch 8, fiber Bragg grating (FBG) demodulator 9, lower-position unit 10, GPRS communication module a11, GPRS communication module b12, upper-position unit 13 are shared, and the fiber grating displacement sensor b25 in the body strain monitoring device only is described here;
The formation of fiber grating displacement sensor b25 as shown in Figure 5; In pipeline c26 bottom fiber grating displacement sensor b25 is installed; Fiber grating displacement sensor b25 is connected through fastener with pipeline c26; Fiber grating displacement sensor b25 can connect with strain transducer; Also can cause optical Fiber Closure c28 through optical patchcord 27 separately, be connected with optical cable through optical Fiber Closure c28;
Wherein fiber grating displacement sensor b25 (see figure 4) is made up of mounting blocks 21, dynamometer link 22, fiber bragg grating 23, load-bearing plate 24; Mounting blocks 21 connects into " worker " font by dynamometer link 22 and load-bearing plate 24, and fiber bragg grating 23 is fixed on the dynamometer link 22; Load-bearing plate 24 is used to bear and stays soil body gravity, and fiber bragg grating 23 is measured the strain that dynamometer links 22 take place, and is converted into displacement through corresponding relation; Mounting blocks 21 is convenient to being installed on the pipeline of sensor-robust; Wherein dynamometer link 22 is threaded with mounting blocks 21 with load-bearing plate 24, dynamometer link 22, and mounting blocks 21 is connected through fastener with pipeline;
The measurement mechanism of pipeclay relative displacement monitoring device can be understood the situation of pipeclay relative displacement through strain stress P as shown in Figure 6; When measurement strain stress P reaches threshold value and keeps constant, show that body has been in vacant state;
The said sky subsidence area horizontal distortion monitoring device of adopting equally also comprises optical fiber grating sensing net b32, optical switch 8, fiber Bragg grating (FBG) demodulator 9, lower-position unit 10, GPRS communication module a11, GPRS communication module b12, upper-position unit 13; Because optical switch 8, fiber Bragg grating (FBG) demodulator 9, lower-position unit 10, GPRS communication module a11, GPRS communication module b12, upper-position unit 13 are shared, only illustrate with regard to optical fiber grating sensing net b32;
The formation of optical fiber grating sensing net b32 as shown in Figure 8; When body has laid to the pipe trench design attitude, and earthing is backfilled to Guan Dinghou, is that optical fiber grating sensing net b32 is laid on the surface that the center flattens in each 5m scope of both sides (piping lane band) with pipeline d31 axis, and length is decided by the scope of adopting the sky subsidence area;
Wherein optical fiber grating sensing net b32 is made up of non-woven geotextile 29, fiber bragg grating reinforcing bar sensor 30.Fiber bragg grating reinforcing bar sensor 30 is woven into " # " font and is fixed in the middle of the up and down two-layer non-woven geotextile 29; Each fiber bragg grating reinforcing bar sensor is separately 1 the tunnel, and the fiber bragg grating number needs on every road is decided according to adopting the actual conditions that sky subsides, and is connected with optical cable c34 through optical Fiber Closure c33, and finally causes the monitoring station.
The output signal of three type optical fiber grating sensors of body strain, pipeclay relative displacement, subsidence area horizontal distortion through optical switch one by one conducting transfer to fiber Bragg grating (FBG) demodulator 9; The centre wavelength displacement amount that fiber Bragg grating (FBG) demodulator 9 demodulates each fiber-optic grating sensor transfers to lower-position unit 10, and the cycle of optical switch 8 Continuity signals is by lower-position unit 10 controls.10 pairs of data of lower-position unit are carried out pretreatment; And the data after will handling are defeated by GPRS transmission module a11; GPRS transmission module a11 is transferred to the upper-position unit 13 that is positioned at office with each monitoring variable that lower-position unit 10 calculates through public's cordless communication network; Upper-position unit carries out analysing and processing through self-programmed software to data, is shown by display device.
The field monitoring station is arranged on adopts near the valve chamber in sky subsidence area, comprises following a few part:
(1) optical Fiber Closure of monitoring station and each sensor be connected optical cable, the sensor signal concentration of transmissions that is used for adopting each position on the sky subsidence area is to the monitoring station;
(2) optical switch 8, and sky subsides and the sensor of pipeline is a lot of because monitoring is adopted, and signalling channel is numerous, can't once be connected on the fiber Bragg grating (FBG) demodulator 9, with optical switch 8 each channel signal changed to fiber Bragg grating (FBG) demodulator 9 successively and analyzed;
(3) fiber Bragg grating (FBG) demodulator 9, are used to demodulate the centre wavelength displacement amount of each sensor;
(4) computer and program are used to control the frequency of (FBG) demodulator demodulation, and the centre wavelength displacement amount that (FBG) demodulator demodulates is calculated as each monitoring variable automatically, and these monitoring variables are sent to the GPRS communication module, and the signal that receives the GPRS communication module is controlled;
(5) GPRS communication module is used for each monitoring variable of COMPUTER CALCULATION is transferred to the server that is positioned at office through cordless communication network, also can accept the signal of server, sends to computer.
The working principle of this system is: when adopting 1 distortion of sky subsidence area, the strain of pipeline a2 changes because of the effect that stays of bearing the soil body, measures through the strain transducer a3 on the body; Simultaneously, along with adopting constantly carrying out that sky subsides, the displacement between pipeline and its below soil body also changes, and measures through displacement transducer a4; Adopt sky subsidence area horizontal distortion through horizontal distortion monitoring device a5 monitoring simultaneously.By connecting optical cable a7; The sensor signal concentration of transmissions of adopting each position, sky subsidence area is arrived photoswitch 8; Photoswitch 8 changes each channel signal to fiber Bragg grating (FBG) demodulator 9 successively; Fiber Bragg grating (FBG) demodulator 9 demodulates each sensor wavelength centre wavelength displacement and sensing is given field computer 10; Field computer 10 is calculated as each monitoring variable automatically with the centre wavelength displacement that (FBG) demodulator demodulates; And monitoring variable sent to on-the-spot GPRS communication module a11; GPRS communication module a11 transmits signal by cordless communication network; B12 sends host computer 13 to the GPRS communication module; Host computer 13 provides warning with each monitoring variable and alarm threshold value contrast in the time of necessary.
The advantage of native system shows:
(1) adopts the sky subsidence area influence safe early warning of oil and gas pipes down with many indexs;
(2) fiber grating sensing technology is applied to adopt sky subsidence area monitoring, this technology is anti-interference, corrosion-resistant, it is with the obvious advantage to be easy to networking etc.; This technology is easy to realize the remote auto real time on-line monitoring, and cost is lower;
(3) body strain monitoring; In each monitoring cross section 3 sensors (90 ° or 120 ° of distributions) are installed evenly; Realized the monitoring purpose with minimum monitoring point; Practiced thrift cost; The installation time that has also reduced equipment reaches the damage to body; For the control of adopting sky subsidence area pipeline provides effective foundation, guaranteed the safety of pipeline;
(4) pipeclay relative displacement monitoring; Adopt the feature of sky subsidence area according to the pipeline place; 1 fiber grating displacement sensor is installed under the body in each body strain monitoring cross section; Be used to the relative displacement situation of monitoring body and underliing the soil body; Judge the position that pipeclay relative displacement and body be whether unsettled and unsettled by the variation of monitor value; Avoided distinguishing by the excavation pipe trench whether body is unsettled; Carry out the selection on protection works opportunitys effective foundation is provided for adopting sky subsidence area oil and gas pipes; Reduced the blindness of protection works and saved pipeline operating cost, also guaranteed the security of operation of pipeline simultaneously, the construction when having reduced the excavation checking is dangerous;
(5) adopt the horizontal distortion monitoring of sky subsidence area, adopt the top soil body strain that the optical fiber grating sensing net is monitored and pipeline directly contacts, just can calculate the horizontal distortion of this zone soil body through the deformation values of monitoring; Simultaneously according to adopting the deformation behaviour that sky subsides; To be converted into subside " monitoring of this quality factor " to " the phenomenon monitoring " of adopting the sky subsidence area; Can forecast surface deformable in advance; Avoided wrong report, improved the efficient and the accuracy of adopting the pipeline early warning of sky subsidence area " face of land obvious distortion do not occur and representes that then pipeline is not stressed or also be in a safe condition ";
(6) native system have automatically, continuously, characteristics timely; Can accurately and timely grasp the steady state of adopting the sky subsidence area soil body, body safe condition and secretly outstanding state whether, can strong foundation be provided improvement reinforcing of adopting the sky subsidence area and the science decision that pipe safety protects opportunity.
Description of drawings
Fig. 1 adopts sky subsidence area oil and gas pipes monitoring system pie graph
Fig. 2 body strain monitoring installation drawing
Fig. 3 body strain transducer position view
Fig. 4 displacement transducer pie graph
Fig. 5 pipeclay relative displacement monitoring device figure
The measurement mechanism figure of Fig. 6 pipeclay relative displacement monitoring device
Fig. 7 optical fiber grating sensing net pie graph
Fig. 8 soil body horizontal distortion monitoring device figure
Fig. 9 adopts sky subsidence area oil and gas pipes Fundamentals of Supervisory Systems figure
Figure 10 adopts sky subsidence area oil and gas pipes monitoring system electrical schematic diagram
Wherein 1-adopts sky subsidence area 2-pipeline a
3-fiber Bragg grating strain sensor a 4-pipeclay relative displacement transducer a
5-optical fiber grating sensing net a 6-optical Fiber Closure a
7-optical cable a 8-optical switch
9-fiber Bragg grating (FBG) demodulator 10-lower-position unit
11-GPRS communication module a 12-GPRS communication module b
13-upper-position unit 14-pipeline b
15-fiber Bragg grating strain sensor a16-fiber Bragg grating strain sensor b
17-fiber Bragg grating strain sensor c 18-temperature compensation sensor
19-optical Fiber Closure b 20-optical cable b
21-mounting blocks 22-dynamometer link
23-fiber bragg grating 24-load-bearing plate
25-pipeclay relative displacement transducer b 26-pipeline c
27-optical patchcord 28-optical Fiber Closure c
29-non-woven geotextile 30-fiber bragg grating reinforcing bar sensor
31-pipeline d 32-optical fiber grating sensing net b
33-optical Fiber Closure c 34-optical cable c
Embodiment
Embodiment. this example is an experimental system, and it constitutes like Fig. 1-shown in Figure 10.One adopt adopt deeply that thickness rate is 10, exploitation length 15m, buried depth of pipeline 3m, duct length be that adopting on the sky subsidence area of 130m tested, pipe diameter is that 168mm, wall thickness are 6mm, grade of steel L245.
Adopt sky subsidence area oil and gas pipes monitoring system and be divided into collection in worksite emission system and long-range receiving and analyzing system, specifically comprise body strain monitoring device, pipeclay relative displacement monitoring device, adopt the receiving terminal (upper-position unit) of sky subsidence area horizontal distortion monitoring device, field monitoring station, office.
The overall formation of adopting sky subsidence area oil and gas pipes monitoring system as shown in Figure 1.Fiber Bragg grating strain sensor a3 and pipeclay relative displacement transducer a4 are installed on the monitoring cross section of the oil and gas pipes a2 that adopts sky subsidence area 1; Sensor welding series connection on each cross section; Be connected with the optical cable a7 that causes the monitoring station through optical Fiber Closure a6 then; In the monitoring station; Optical cable a7 is connected with optical switch 8; Optical switch 8 is connected with fiber Bragg grating (FBG) demodulator 9; Fiber Bragg grating (FBG) demodulator 9 is connected with lower-position unit 10; Lower-position unit 10 pretreated data are through GPRS communication module a11 transmission, and GPRS communication module b12 passes to upper-position unit 13 after receiving; Simultaneously, optical fiber grating sensing net a5 monitors earth horizontal displacement in real time, also with data transmission to upper-position unit 13.
The concrete formation of adopting sky subsidence area oil and gas pipes combination monitoring system as shown in Figure 9, this system is divided into on-site data gathering transmission system and long-range receiving and analyzing system.Comprising body strain monitoring device, pipeclay relative displacement monitoring device, adopt sky subsidence area horizontal distortion monitoring device three parts.
The on-site data gathering transmission system comprises optical fiber grating sensing net, fiber Bragg grating strain sensor, fiber grating displacement sensor, optical switch, fiber Bragg grating (FBG) demodulator, lower-position unit, GPRS communication module; Optical fiber grating sensing net, fiber Bragg grating strain sensor, fiber grating displacement sensor output connect the input of optical switch respectively; The output of optical switch connects the input of fiber Bragg grating (FBG) demodulator; The output of fiber Bragg grating (FBG) demodulator connects the input of lower-position unit, and the output of lower-position unit connects the GPRS communication module.
Long-range receiving and analyzing system comprises that GPRS communication module, upper-position unit, the reception of data-signal remote live, data signal analysis and processing, change curve dynamically show; The output of GPRS communication module connects the input of upper-position unit, and the output of upper-position unit connects the dynamically input of demonstration of the reception of data-signal remote live, data signal analysis and processing, change curve respectively.
Fiber Bragg grating strain sensor a3 and pipeclay relative displacement transducer a4 pass to optical switch 8 with body strain and pipeclay relative displacement signal through optical cable a7; Optical switch 8 is after fiber Bragg grating (FBG) demodulator 9 demodulation reach lower-position unit 10; Lower-position unit 10 calls self-editing program; Control optical switch 8 and fiber Bragg grating (FBG) demodulator 9 are realized the collection of data and data are carried out pretreatment; Pretreated data receive through GPRS communication module a11 transmission, GPRS communication module b12 and pass to upper- position unit 13, and 13 pairs of data of upper-position unit are carried out further analysing and processing, judge the force and deformation state and the pipeclay relative displacement of pipeline; Simultaneously; Optical fiber grating sensing net a5 monitors soil body horizontal distortion in real time; Also with the same manner with data transmission to upper-position unit 13; 13 pairs of soil deformation data of upper-position unit are analyzed; And combine the distortion of pipeline and the analysis result of pipeclay relative displacement, judge the safe condition of slow-witted empty subsidence area pipeline and the situation of subsiding of the goaf soil body.
The electric principle of this system as shown in figure 10; Monitoring pipe body strain respectively; The pipeclay relative displacement; Three type optical fiber grating sensors--the fiber Bragg grating strain sensor a3 of subsidence area horizontal distortion; Fiber grating displacement sensor a4; The PC joint of optical fiber grating sensing net a5 is connected with the PC joint of optical switch 8 with optical cable a7; The R232 of optical switch 8 connects the R232 interface of lower-position unit 10; The PC joint of optical switch 8 connects the PC interface of fiber Bragg grating (FBG) demodulator 9SM125; The LAN port of fiber Bragg grating (FBG) demodulator 9SM125 connects the LAN port of lower-position unit 10; The output of lower-position unit 10 is by the VGA end of VGA termination display device; The R232 port of lower-position unit 10 connects the R232 port of GPRS transmission module a11 Siemens MC 35i; GPRS transmission module a11 is through antenna GSM; GPRS network; Received the R232 that is afterwards received upper-position unit 13 by R232 by GPRS receiving module b12 antenna GSM, the output of upper-position unit 13 is by the VGA end of VGA termination display device.
The output signal of three type optical fiber grating sensors of body strain, pipeclay relative displacement, subsidence area horizontal distortion through optical switch 8 one by one conducting transfer to fiber Bragg grating (FBG) demodulator 9; The centre wavelength displacement amount that fiber Bragg grating (FBG) demodulator 9 demodulates each fiber-optic grating sensor transfers to lower-position unit 10, and the cycle of optical switch 8 Continuity signals is by lower-position unit 10 controls.10 pairs of data of lower-position unit are carried out pretreatment; And the data after will handling are defeated by GPRS transmission module a11; GPRS transmission module a11 is transferred to the upper-position unit 13 that is positioned at office with each monitoring variable that lower-position unit 10 calculates through public's cordless communication network; Upper-position unit carries out analysing and processing through self-programmed software to data, is shown by display device.
Wherein:
Body strain monitoring device as shown in Figure 2; Arrange 17 monitoring cross sections at pipeline b14; 3 fiber Bragg grating strain sensor a15 are evenly arranged in each monitoring cross section 90 degree directions at interval; Fiber Bragg grating strain sensor b16; Fiber Bragg grating strain sensor c17 and a temperature compensation sensor 18; 4 sensors are connected through welding; Be connected with optical cable b20 through optical Fiber Closure b19 then; Optical cable b20 is connected to the optical switch 8 in the monitoring station; Optical switch 8 is connected with fiber Bragg grating (FBG) demodulator 9; Fiber Bragg grating (FBG) demodulator 9 is connected with lower-position unit 10; Lower-position unit 10 pretreated data outputs connect GPRS communication module a11 transmission, and GPRS communication module b12 receives upper-position unit 13 after receiving; The lower-position unit 10 of monitoring station calls self-editing program, control fiber Bragg grating (FBG) demodulator 9, the real-time automatic collecting of realization data.
In the above-mentioned monitoring device:
Fiber Bragg grating strain sensor: BGK-FBG-4150;
Optical switch selects for use light to swell SUM-FSW;
Fiber Bragg grating (FBG) demodulator is selected SM125 for use;
Pipeclay relative displacement monitoring device as shown in Figure 5; In pipeline c26 bottom fiber grating displacement sensor b25 is installed; Fiber grating displacement sensor b25 is connected through fastener with pipeline c26; Fiber grating displacement sensor b25 can connect with strain transducer; Also can cause optical Fiber Closure b28 through optical patchcord 27 separately, be connected with optical cable through optical Fiber Closure b28; Optical cable causes the monitoring station with signal, and monitoring station lower-position unit 10 calls self-editing program, control fiber Bragg grating (FBG) demodulator 9, the real-time automatic collecting of realization data;
Wherein fiber grating displacement sensor b25 is made up of mounting blocks 21, dynamometer link 22, fiber bragg grating 23, load-bearing plate 24, like Fig. 6.Mounting blocks 21 connects into " worker " font by dynamometer link 22 and load-bearing plate 24, and fiber bragg grating 23 is fixed on the dynamometer link 22; Load-bearing plate 24 is used to bear and stays soil body gravity, and fiber bragg grating 23 is measured the strain that dynamometer links 22 take place, and is converted into displacement through corresponding relation; Mounting blocks 21 is convenient to being installed on the pipeline of sensor-robust; Wherein dynamometer link 22 is threaded with mounting blocks 21 with load-bearing plate 24, dynamometer link 22, and mounting blocks 21 is connected through fastener with pipeline;
Wherein:
Fiber grating displacement sensor: select the fiber-optic grating sensor of designing packaging voluntarily for use;
Fiber Bragg grating (FBG) demodulator 9 is selected SM125 for use;
Adopting sky subsidence area soil body horizontal distortion monitoring device as shown in Figure 8, is that the optical fiber grating sensing net is laid on the surface that the center flattens in each 5m scope of both sides (piping lane band) with pipeline d31 axis; The optical fiber grating sensing net is made up of non-woven geotextile 29, fiber bragg grating reinforcing bar sensor 30; Fiber bragg grating reinforcing bar sensor 30 is woven into " # " font and is fixed in the middle of the up and down two-layer non-woven geotextile 29.Each fiber bragg grating reinforcing bar sensor is separately 1 the tunnel, and spacing is that 2m, each one tunnel road spacing that is adjacent of both sides are 1m between, the middle part 5 tunnel axial arranged 7 tunnel along pipeline d31, and every road is provided with 6 gratings, spacing is 4m; Is that each symmetric arrangement 4 tunnel of both sides, medial axis, center 1 tunnel (arranging 5 tunnel altogether), spacing are 4m along vertical pipe d31 axial direction with the center, subsidence area, and every road is provided with 7 gratings, spacing is 1.67m; Be connected with optical cable c34 through optical Fiber Closure c33, and finally cause the monitoring station;
Wherein:
Fiber bragg grating reinforcing bar sensor 30: select the fiber-optic grating sensor of designing packaging voluntarily for use;
Fiber Bragg grating (FBG) demodulator 9 is selected SM125 for use.
The field monitoring station is arranged on adopts monitoring scene, sky subsidence area, as shown in Figure 1, comprises optical Fiber Closure a6, connects optical cable a7, optical switch 8, fiber Bragg grating (FBG) demodulator 9, lower-position unit 10, GPRS transmission module a11; The signal of each fiber-optic grating sensor collection is received the optical switch 8 of monitoring station through optical cable a7, and optical switch 8 outputs connect fiber Bragg grating (FBG) demodulator 9, and fiber Bragg grating (FBG) demodulator 9 outputs connect lower-position unit 10, and lower-position unit 10 outputs meet GPRS transmission module a11.
The FBG sensors signal acquisition stations received through the cable a7 optical switch 8, the optical switch 8 turn each channel signal conversion to fiber grating demodulator 9, 9 FBG demodulator demodulates the FBG sensors center wavelength shift amount to the next bit machine 10, the next-bit machine 10 automatically calculated for each monitoring quantities lost GPRS transmission module a11 and accept the GPRS transmission module a11 signal control, GPRS transmit module a11 will lower machine 10 calculated the monitoring capacity through public wireless communication network to the receiving terminal located in the Office of the host computer 13 for further analysis and processing; while lower machine 10 may also be accepted via GPRS transmission module b12 PC 13 receives a signal.
Wherein:
Optical switch 8: select for use light to swell scientific and technological SUM-FSW;
Fiber Bragg grating (FBG) demodulator 9: select SM125 for use;
Lower-position unit 10 and program: select for use and grind magnificent IPC-610, program is self-editing;
Upper-position unit 13 and program: select for use and grind magnificent IPC-610, program is self-editing;
GPRS transmission module a11: Siemens MC 35i
The receiving terminal that is positioned at office comprises following 2 parts:
(1) GPRS receiving module b12 is used to receive the monitoring variable that field monitoring station GPRS transmission module a11 sends, and is transferred to upper-position unit 13, sends feedback command also can for on-the-spot GPRS transmission module a11;
(2) upper-position unit 13 and program are used for the signal of download terminal GPRS receiving module b12, and caller analyzes automatically, and analysis result and alarm threshold value are compared, and implement in the time of necessary to report to the police.
The working principle of this system is: when adopting sky subsidence area 1 soil body and stay; The pipeline a2 that is embedded in soil body below receives effect and the strain that bends of top soil body load; Body fiber Bragg grating strain sensor a3 experiences stretching strain; Through calculating the maximum strain and the position that can draw body, the i.e. axial strain of pipeline a2; Because the pipeline a2 below soil body constantly subsides; Be embedded in the pipeclay relative displacement transducer a4 that adopts sky subsidence area 1 and in bearing the process of earth pressure, produce tensional strain; Fiber bragg grating 23 on the pipeclay relative displacement transducer a4 is experienced stretching strain; Can draw pipeclay relative displacement and strain through calculating, promptly to judge the position that pipeline a2 is whether unsettled and unsettled; Adopt in the process of the bottom-up activity of sky subsidence area 1 soil body, at pipeline a2 and above it on surface of contact of earthing, the horizontal strain of the soil body is measured through optical fiber grating sensing net a5, can draw the distortion of soil body maximum horizontal through calculating.
By connecting optical cable a7; The sensor signal concentration of transmissions of each position of monitoring section is arrived photoswitch 8; Photoswitch 8 changes each channel signal to fiber Bragg grating (FBG) demodulator 9 successively; Fiber Bragg grating (FBG) demodulator 9 demodulates each sensor wavelength centre wavelength displacement and sensing is given slave computer 10; Slave computer 10 is calculated as each monitoring variable automatically with the centre wavelength displacement that (FBG) demodulator demodulates; Maximum strain, pipeclay relative displacement and strain like pipeline a2; Soil body horizontal distortion etc.; And monitoring variable sent to on-the-spot GPRS transport module a11; GPRS transport module a11 is transferred to terminal GPRS receiver module a12 by public's cordless communication network with signal; Terminal GPRS receiver module a12 sends to terminal host computer 13; Host computer 13 provides warning with each monitoring variable and alarm threshold value contrast in the time of necessary.
Wherein:
GPRS receiving module a12: select Siemens MC 35i for use;
Lower-position unit 10 and program: select for use and grind magnificent IPC-610, program is self-editing;
Upper-position unit 13 and program: select for use and grind magnificent IPC-610; Program is self-editing.
With said system when monitoring; Carry out the monitoring of soil deformation by installation fiber Bragg grating strain sensor a3 and optical fiber grating sensing net a5 on the monitoring cross section of the oil and gas pipes a2 that adopts sky subsidence area 1, carry out pipeclay relative displacement monitoring by pipeclay relative displacement transducer a4;
The signal that collects is done pretreatment by lower-position unit 10 after optical switch 8, fiber Bragg grating (FBG) demodulator a9 demodulation;
Lower-position unit 10 pretreated data receive upper-position unit 13 through GPRS communication module a11 transmission, GPRS communication module b12; Whether upper-position unit 13 judgment data are complete, return lower-position unit 10 pretreatment when imperfect again; The complete upper-position unit 13 that then passes to;
13 pairs of signals of upper-position unit are done further to analyze and handle;
Adopt sky by upper-position unit 13 output and subside that soil body horizontal distortion change dynamics shows, body axial strain change dynamics shows, pipeclay relative displacement change dynamics shows; And whether judgment data exceeds threshold value;
The alarm threshold value of body axial strain be body the limiting strain value 70%, the alert if of pipeclay relative displacement is that monitor value surpasses predefined value and keeps constant, the alert if of soil body horizontal distortion is that sudden change appears in monitoring curve;
When three parameter values show that then pipeline is in a safe condition during all less than threshold value separately;
When 70% or the pipeclay relative displacement value that reaches the limiting strain value of body when the body axial strain reaches threshold value and keeps constant or soil body horizontal distortion curve carry out the combined pre-warning of pipe safety when sudden change occurring.
If adopting the soil body of sky subsidence area 1 stays; The pipeline a2 that is embedded in soil body below receives effect and the strain that bends of top soil body load; Body fiber Bragg grating strain sensor a3 experiences stretching strain, through calculating the maximum strain and the position that can draw body, the i.e. axial strain of pipeline a2; Because the pipeline a2 below soil body constantly subsides; Be embedded in the pipeclay relative displacement transducer a4 that adopts sky subsidence area 1 and in bearing the process of earth pressure, produce tensional strain; Fiber bragg grating 23 on the pipeclay relative displacement transducer a4 is experienced stretching strain; Can draw pipeclay relative displacement and strain through calculating, promptly to judge the position that pipeline a2 is whether unsettled and unsettled; Adopt in the process of the bottom-up activity of sky subsidence area 1 soil body, at pipeline a2 and above it on surface of contact of earthing, the horizontal strain of the soil body is measured through optical fiber grating sensing net a5, can draw the distortion of soil body maximum horizontal through calculating.Thus, just can intactly measure pipeline a2 and go up suffered various strain capacitys, and can calculate stress value.
Through monitoring for a long time, this example is easy to realize adopting the real-time automatic collecting analysis and the long-range issue of sky subsidence area 1 and pipeline a2 combined monitoring data, and remote live is reported to the police automatically.Avoided loaded down with trivial details artificial image data, improved the precision of early warning, reduced time of fire alarming, can also accurately locate simultaneously place of alarm, this to the pipeline emergency measure take most important.
Claims (6)
1 A mining subsidence area of oil and gas pipeline monitoring system, characterized in that it comprises a tube body strain monitoring devices, pipe-soil relative displacement monitoring devices, mining subsidence area horizontal deformation monitoring device of three parts; in mining subsidence area an oil and gas Pipe a (2) is installed on the monitoring of cross-section fiber grating strain sensor a (3) and the pipe-soil relative displacement sensor a (4), each section of the sensor fusion series, and then through the fiber optic terminal box a (6) and lead to The cable station a (7) connected to the monitoring station, the cable a (7) and the optical switch (8) is connected, the optical switch (8) and the fiber grating demodulator (9) connected to the FBG demodulator ( 9) and the next crew (10) connected to the lower machine (10) after pretreatment data through the GPRS communication module a (11) transfer, GPRS communication module b (12) after receiving the transmitted PC (13); Meanwhile, the tube Top laying fiber grating sensor network a (5) Real-time monitoring of soil horizontal displacement, but also the data transmitted to the host (13);...
The output signal of three type optical fiber grating sensors of body strain, pipeclay relative displacement, subsidence area horizontal distortion through optical switch one by one conducting transfer to fiber Bragg grating (FBG) demodulator (9); The centre wavelength displacement amount that fiber Bragg grating (FBG) demodulator (9) demodulates each fiber-optic grating sensor transfers to lower-position unit (10), and the cycle of optical switch (8) Continuity signal is controlled by lower-position unit (10).Lower-position unit (10) carries out pretreatment to data; And the data after will handling are defeated by GPRS transmission module a (11); GPRS transmission module a (11) is transferred to the upper-position unit (13) that is positioned at office with each monitoring variable that lower-position unit (10) calculates through public's cordless communication network; Upper-position unit carries out analysing and processing through self-programmed software to data, is shown by display device.
2. the sky subsidence area oil and gas pipes monitoring system of adopting according to claim 1 is characterized in that this system is divided into on-site data gathering transmission system and long-range receiving and analyzing system; Comprising body strain monitoring device, pipeclay relative displacement monitoring device, adopt sky subsidence area horizontal distortion monitoring device three parts;
The on-site data gathering transmission system comprises optical fiber grating sensing net, fiber Bragg grating strain sensor, fiber grating displacement sensor, optical switch, fiber Bragg grating (FBG) demodulator, lower-position unit, GPRS communication module; Optical fiber grating sensing net, fiber Bragg grating strain sensor, fiber grating displacement sensor output connect the input of optical switch respectively; The output of optical switch connects the input of fiber Bragg grating (FBG) demodulator; The output of fiber Bragg grating (FBG) demodulator connects the input of lower-position unit, and the output of lower-position unit connects the GPRS communication module;
Long-range receiving and analyzing system comprises that GPRS communication module, upper-position unit, the reception of data-signal remote live, data signal analysis and processing, change curve dynamically show; The output of GPRS communication module connects the input of upper-position unit, and the output of upper-position unit connects the dynamically input of demonstration of the reception of data-signal remote live, data signal analysis and processing, change curve respectively;
Fiber Bragg grating strain sensor a (3) and pipeclay relative displacement transducer a (4) pass to optical switch (8) with body strain and pipeclay relative displacement signal through optical cable a (7); Optical switch (8) back fiber bragg grating reaches lower-position unit (10) through (FBG) demodulator (9) demodulation; Lower-position unit (10) calls self-editing program; Control optical switch (8) and fiber Bragg grating (FBG) demodulator (9) are realized the collection of data and data are carried out pretreatment; Pretreated data receive through GPRS communication module a (11) transmission, GPRS communication module b (12) and pass to upper-position unit (13), and upper-position unit (13) carries out further analysing and processing to data, judges the force and deformation state and the pipeclay relative displacement of pipeline; Simultaneously; Optical fiber grating sensing net a (5) monitors soil body horizontal distortion in real time; Also with the same manner with data transmission to upper-position unit (13); Upper-position unit (13) is analyzed the soil deformation data; And combine the distortion of pipeline and the analysis result of pipeclay relative displacement, judge the situation of subsiding of the safe condition and the goaf soil body of adopting sky subsidence area pipeline.
3. the sky subsidence area oil and gas pipes monitoring system of adopting according to claim 1 and 2; The electric principle that it is characterized in that this system is: monitoring pipe body strain respectively; The pipeclay relative displacement; Three type optical fiber grating sensors of subsidence area horizontal distortion--fiber Bragg grating strain sensor a (3); Fiber grating displacement sensor a (4); The PC joint of optical fiber grating sensing net a (5) is connected with the PC joint of optical switch (8) with optical cable a (7); The R232 of optical switch (8) connects the R232 interface of lower-position unit (10); The PC joint of optical switch (8) connects the PC interface of fiber Bragg grating (FBG) demodulator (9) SM125; The LAN port of fiber Bragg grating (FBG) demodulator (9) SM125 connects the LAN port of lower-position unit (10); The output of lower-position unit (10) is by the VGA end of VGA termination display device; The R232 port of lower-position unit (10) connects the R232 port of GPRS transmission module a (11) Siemens MC 35i; GPRS transmission module a (11) is through antenna GSM; GPRS network; Received the back by GPRS receiving module b (12) antenna GSM and receive the R232 of upper-position unit (13) by R232, the output of upper-position unit (13) is by the VGA end of VGA termination display device;
The output signal of three type optical fiber grating sensors of body strain, pipeclay relative displacement, subsidence area horizontal distortion through optical switch (8) one by one conducting transfer to fiber Bragg grating (FBG) demodulator (9); The centre wavelength displacement amount that fiber Bragg grating (FBG) demodulator (9) demodulates each fiber-optic grating sensor transfers to lower-position unit (10), and the cycle of optical switch (8) Continuity signal is controlled by lower-position unit (10); Lower-position unit (10) carries out pretreatment to data; And the data after will handling are defeated by GPRS transmission module a (11); GPRS transmission module a (11) is transferred to the upper-position unit (13) that is positioned at office with each monitoring variable that lower-position unit (10) calculates through public's cordless communication network; Upper-position unit carries out analysing and processing through self-programmed software to data, is shown by display device.
4. the sky subsidence area oil and gas pipes monitoring system of adopting according to claim 1 and 2; It is characterized in that said body strain monitoring device is evenly to arrange 3 fiber Bragg grating strain sensor a (15), fiber Bragg grating strain sensor b (16), fiber Bragg grating strain sensor c (17) and temperature compensation sensors (18) in each 90 ° of direction in interval, monitoring cross section of pipeline b (14); 4 sensors are connected through welding; Be connected with optical cable b (20) through optical Fiber Closure a (19) then, optical cable b (20) causes the monitoring station with signal.
5. the sky subsidence area oil and gas pipes monitoring system of adopting according to claim 1 and 2; The formation that it is characterized in that fiber grating displacement sensor b (25) in the said pipeclay relative displacement monitoring device is: in pipeline c (26) bottom fiber grating displacement sensor b (25) is installed; Fiber grating displacement sensor b (25) is connected through fastener with pipeline c (26); Fiber grating displacement sensor b (25) can connect with strain transducer; Also can cause optical Fiber Closure c (28) through optical patchcord (27) separately, be connected with optical cable through optical Fiber Closure c (28);
Said fiber grating displacement sensor b (25) is made up of mounting blocks (21), dynamometer link (22), fiber bragg grating (23), load-bearing plate (24); Mounting blocks (21) connects into " worker " font by dynamometer link (22) and load-bearing plate (24), and fiber bragg grating (23) is fixed on the dynamometer link (22); Load-bearing plate (24) is used to bear and stays soil body gravity, and fiber bragg grating (23) is measured the strain that dynamometer link (22) takes place, and is converted into displacement through corresponding relation; Mounting blocks (21) is convenient to being installed on the pipeline of sensor-robust; Wherein dynamometer link (22) is threaded with mounting blocks (21) with load-bearing plate (24), dynamometer link (22), and mounting blocks (21) is connected through fastener with pipeline.
6. the sky subsidence area oil and gas pipes monitoring system of adopting according to claim 1 and 2; It is characterized in that said formation of adopting optical fiber grating sensing net b (32) in the horizontal distortion monitoring device of sky subsidence area is: when body has laid to the pipe trench design attitude; And earthing is backfilled to Guan Dinghou, is that optical fiber grating sensing net b (32) is laid on the surface that the center flattens in each 5m piping lane band scope of both sides with pipeline d (31) axis;
Said optical fiber grating sensing net b (32) is made up of non-woven geotextile (29), fiber bragg grating reinforcing bar sensor (30); Fiber bragg grating reinforcing bar sensor (30) is woven into " # " font and is fixed on two-layer non-woven geotextile (29) centre up and down; Each fiber bragg grating reinforcing bar sensor is separately 1 the tunnel, and the fiber bragg grating number needs on every road is decided according to adopting the actual conditions that sky subsides, and is connected with optical cable c (34) through optical Fiber Closure c (33), and finally causes the monitoring station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010242635 CN102345797B (en) | 2010-07-28 | 2010-07-28 | System for monitoring oil-gas pipeline in mining subsidence area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010242635 CN102345797B (en) | 2010-07-28 | 2010-07-28 | System for monitoring oil-gas pipeline in mining subsidence area |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102345797A true CN102345797A (en) | 2012-02-08 |
| CN102345797B CN102345797B (en) | 2013-11-06 |
Family
ID=45544730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010242635 Active CN102345797B (en) | 2010-07-28 | 2010-07-28 | System for monitoring oil-gas pipeline in mining subsidence area |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102345797B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102345794A (en) * | 2010-07-28 | 2012-02-08 | 中国石油天然气股份有限公司 | System for monitoring oil-gas pipeline in mining subsidence area and constructing method thereof |
| WO2013135033A1 (en) * | 2012-03-16 | 2013-09-19 | 同济大学 | Tunnel deformation online monitoring system based on image analysis and application thereof |
| CN103510986A (en) * | 2013-10-25 | 2014-01-15 | 中国矿业大学 | Tunnel roof separation dynamic monitoring system based on fiber bragg grating and early-warning method thereof |
| CN104613885A (en) * | 2013-11-05 | 2015-05-13 | 中国石油化工股份有限公司 | Tunnel pipeline monitoring and early warning system |
| CN104613318A (en) * | 2013-11-05 | 2015-05-13 | 中国石油化工股份有限公司 | Online monitoring method for tunnel internal pipeline |
| CN105094073A (en) * | 2014-05-22 | 2015-11-25 | 上海燃气浦东销售有限公司 | Real-time dynamic monitoring system for underground pipe network |
| CN113532304A (en) * | 2021-07-20 | 2021-10-22 | 哈尔滨工程大学 | Wing skin structure health state monitoring method based on quasi-distributed fiber bragg grating |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201278198Y (en) * | 2008-09-03 | 2009-07-22 | 中国石油天然气股份有限公司 | Monitoring pre-warning system for influence of landslide to pipeline |
| JP2009294039A (en) * | 2008-06-04 | 2009-12-17 | Mie Univ | Structure deformation monitoring method using distribution type optical-fiber sensing system, and device thereof |
| CN201779455U (en) * | 2010-07-28 | 2011-03-30 | 中国石油天然气股份有限公司 | Mining subsidence area oil gas pipeline monitoring system |
| CN102345794A (en) * | 2010-07-28 | 2012-02-08 | 中国石油天然气股份有限公司 | System for monitoring oil-gas pipeline in mining subsidence area and constructing method thereof |
-
2010
- 2010-07-28 CN CN 201010242635 patent/CN102345797B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009294039A (en) * | 2008-06-04 | 2009-12-17 | Mie Univ | Structure deformation monitoring method using distribution type optical-fiber sensing system, and device thereof |
| CN201278198Y (en) * | 2008-09-03 | 2009-07-22 | 中国石油天然气股份有限公司 | Monitoring pre-warning system for influence of landslide to pipeline |
| CN201779455U (en) * | 2010-07-28 | 2011-03-30 | 中国石油天然气股份有限公司 | Mining subsidence area oil gas pipeline monitoring system |
| CN102345794A (en) * | 2010-07-28 | 2012-02-08 | 中国石油天然气股份有限公司 | System for monitoring oil-gas pipeline in mining subsidence area and constructing method thereof |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102345794A (en) * | 2010-07-28 | 2012-02-08 | 中国石油天然气股份有限公司 | System for monitoring oil-gas pipeline in mining subsidence area and constructing method thereof |
| CN102345794B (en) * | 2010-07-28 | 2013-03-27 | 中国石油天然气股份有限公司 | System for monitoring oil-gas pipeline in mining subsidence area and constructing method thereof |
| WO2013135033A1 (en) * | 2012-03-16 | 2013-09-19 | 同济大学 | Tunnel deformation online monitoring system based on image analysis and application thereof |
| CN103510986A (en) * | 2013-10-25 | 2014-01-15 | 中国矿业大学 | Tunnel roof separation dynamic monitoring system based on fiber bragg grating and early-warning method thereof |
| CN103510986B (en) * | 2013-10-25 | 2015-05-20 | 中国矿业大学 | Tunnel roof separation dynamic monitoring system based on fiber bragg grating and early-warning method thereof |
| CN104613885A (en) * | 2013-11-05 | 2015-05-13 | 中国石油化工股份有限公司 | Tunnel pipeline monitoring and early warning system |
| CN104613318A (en) * | 2013-11-05 | 2015-05-13 | 中国石油化工股份有限公司 | Online monitoring method for tunnel internal pipeline |
| CN104613885B (en) * | 2013-11-05 | 2018-06-15 | 中国石油化工股份有限公司 | A kind of tunnel interior conduit monitoring and warning system |
| CN105094073A (en) * | 2014-05-22 | 2015-11-25 | 上海燃气浦东销售有限公司 | Real-time dynamic monitoring system for underground pipe network |
| CN113532304A (en) * | 2021-07-20 | 2021-10-22 | 哈尔滨工程大学 | Wing skin structure health state monitoring method based on quasi-distributed fiber bragg grating |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102345797B (en) | 2013-11-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201779455U (en) | Mining subsidence area oil gas pipeline monitoring system | |
| CN102345796B (en) | Method for monitoring oil-gas pipeline in mining subsidence area | |
| CN102345793A (en) | Method and system for monitoring oil-gas pipeline in mining subsidence area and system constructing method | |
| CN102345472A (en) | Method and system for monitoring horizontal deformation of soil body in mined-out subsidence area and method for constructing system | |
| CN102345795B (en) | Method and system for monitoring pipe-soil relative displacement of oil-gas pipeline in mining subsidence area | |
| CN102346016B (en) | Mined-out subsidence area soil horizontal deformation monitoring method and system thereof | |
| CN101667324B (en) | Method and system for monitoring and warning pipeline landslide and method for constructing system | |
| CN102345797B (en) | System for monitoring oil-gas pipeline in mining subsidence area | |
| CN102345794B (en) | System for monitoring oil-gas pipeline in mining subsidence area and constructing method thereof | |
| CN201278201Y (en) | Pipeline landslide monitoring pre-alarming system based on fiber grating | |
| CN101667327B (en) | Method and system for monitoring and warning pipeline landslide depth displacement and method for constructing system | |
| Rajeev et al. | Distributed optical fibre sensors and their applications in pipeline monitoring | |
| CN101667328B (en) | Method and system for monitoring and warning pipeline landslide surface displacement and method for constructing system | |
| CN101667326B (en) | Method and system for monitoring and warning influence of landslide on pipeline | |
| CN201278199Y (en) | Pipeline landslide deep displacement monitoring pre-alarming system based on fiber grating | |
| CN102346012B (en) | Construction method of monitoring system for mining subsidence area oil gas pipeline pipe soil relative displacement | |
| CN102345798A (en) | System for monitoring pipe-soil relative displacement of oil-gas pipeline in mining subsidence area | |
| CN201803704U (en) | Soil mass horizontal deformation monitoring system used in mining subsidence area | |
| CN103528749B (en) | Based on coal mine tunnel top board hydraulic pressure on-line monitoring system and the method for fiber grating | |
| CN112197815A (en) | Gypsum ore collapse monitoring system and construction method | |
| Jinyi et al. | A health monitoring system for inverted arch of salt rock tunnel based on laser level deformation monitor and wFBG | |
| CN103700223A (en) | Oil-gas pipeline torrential flood disaster monitoring system | |
| CN103383244B (en) | The construction method of a kind of permafrost region oil and gas pipes monitoring method and system and system | |
| CN102346017A (en) | System for monitoring horizontal deformation of soil body at worked-out subsidence area | |
| CN211147738U (en) | Distributed optical fiber cave depot fracture water monitoring and early warning system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211105 Address after: Room 08-10, 6 / F, block a, No. 5, Dongtucheng Road, Chaoyang District, Beijing 100013 Patentee after: National Petroleum and natural gas pipeline network Group Co.,Ltd. Address before: 100007 Oil Mansion, 9 North Avenue, Dongcheng District, Beijing, Dongzhimen Patentee before: PETROCHINA Co.,Ltd. |
|
| TR01 | Transfer of patent right |